On 2022-09-05, STEFFAN DIEDRICHSEN wrote:
The DC offset poses no problem. The impulse response of a every low
pass filter has a DC offset, that’s the nature of it.
The impulse response has. Its convolution with an arbitrary signal
however does not.
Think of the inverse filter. Hit with the impulse response of the
inverse filter, a filter will necessarily yield an impulse, regardless
of what the original impulse response was. (Though how you did it might
be a problem; there might be some singularities at play.)
In very low low bandwidth lowpass filters, such as DC-cutters, here on
DSP, you'd actually probably like to talk about numerically induced
noise, drift, and the stability problems they cause.
--
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